CN109036262A - The display characteristic curve correcting method and control system of medical LED display - Google Patents
The display characteristic curve correcting method and control system of medical LED display Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
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Abstract
The present invention relates to a kind of display characteristic curve correcting methods of medical LED display, this method includes the following steps: to receive 10bit medical image gradation data, judgement is carried out to each affiliated tonal range of pixel 10bit gradation data and transformation coefficient table is searched according to judging result, obtains corresponding adjustment factor and gamma factor；Each pixel 10bit gradation data is converted using gamma transformation formula (1) to obtain the M bit gradation data of each pixel；The M bit gradation data of each pixel is multiplied to obtain the M bit driving data of each pixel with corresponding brightness correction coefficients in J correction coefficient table, drives medical LED display to be shown with this.The present invention can obtain the LED display driving data for meeting dicom standard, realize the processing and display of medical image data, meet medical demand.
Description
Technical field
The invention belongs to LED display technical fields, are related to a kind of display characteristic curvature correction side of medical LED display
Method and control system.
Background technique
Medical image subject is the outstanding feature of large hospital modernization, is clinical most important diagnostic method, and into
The powerful means and important treatment means of row medical research.Medical LCD at present, it is single due to the limitation of technology
A display is difficult to 100 cun or more；There is the splicing gaps of 0.5-4mm again for multiple liquid crystal display splicing units, significantly
Reduce the display precision of image, while the color of each unit, having differences property of brightness decay, picture uniformity after long-time service
It is difficult to ensure.With being constantly progressive for LED chip manufacture, integration packaging, display control and technology, high definition LED display is produced
The development trend that product will lead LED to show.LED dot spacing shows product with size is big, image quality is high, image is fine, seamless
Unlimited splicing, can pointwise correction the advantages that, huge effect can be played in medical display field.
Summary of the invention
The invention solves a technical problem be to provide the display characteristic curvature correction side of medical LED display a kind of
Method, this method enable to the display characteristic curve of LED display and dicom standard curve to coincide.
In order to solve the above-mentioned technical problem, the display characteristic curve correcting method of medical LED display of the invention includes
Following step:
Step 1: receive 10bit medical image gradation data, to each affiliated tonal range of pixel 10bit gradation data into
Row judgement simultaneously searches transformation coefficient table according to judging result, obtains corresponding adjustment factor and gamma factor；Utilize gamma transformation
Formula (1) converts each pixel 10bit gradation data to obtain the M bit gradation data of each pixel；
Wherein giFor the 10bit gradation data of pixel i, siFor the M bit gradation data of pixel i；cjFor belonging to pixel i
The corresponding adjustment factor of tonal range j, γjFor the corresponding gamma factor of tonal range j belonging to pixel i, j=1,2 ... J, J are
The tonal range quantity of division；J is 3~4；
Step 2: the M bit gradation data of each pixel is multiplied with brightness correction coefficients corresponding in J correction coefficient table
Obtain the M bit driving data of each pixel；
The method for building up of the transformation coefficient table and correction coefficient table is as follows:
Step 1 establishes transformation coefficient table；
Input belongs to 10bit gradation data in each tonal range respectively, is converted to obtain to it pair using formula (2)
The M bit gradation data to be calibrated answered drives medical LED display to be shown with M bit gradation data to be calibrated；
Wherein gjFor the 10bit gradation data for belonging to tonal range j, sjFor corresponding M bit gradation data to be calibrated；γj
For the corresponding gamma factor of tonal range j；If the initial value of adjustment factor c is c0, c0=2.44x10-4~5.52x10-3, to doctor
It is acquired with the brightness data of each pixel of LED display, while constantly adjustment adjustment factor c, so that display screen display characteristic
Curve approaches dicom standard curve, finally obtains the adjustment factor c corresponding to tonal range jj；By γj、cjIt is stored in transformation coefficient
Table finally obtains the transformation coefficient table contained corresponding to each tonal range gamma factor and adjustment factor；
Step 2 establishes correction coefficient table:
Input belongs to the 10bit gradation data of each tonal range respectively, searches transformation coefficient table and obtains corresponding adjusting system
Several and gamma factor；Each pixel 10bit gradation data is converted using gamma transformation formula to obtain the M bit ash of each pixel
Degree evidence drives medical LED display to be shown with this；
The brightness data of each pixel of medical LED display is acquired, at the same by display screen display characteristic curve with
Dicom standard is compared, and adjusts the corresponding brightness correction coefficients of each pixel, is guaranteeing the entire consistent premise of brightness of display screen
Down so that display screen display characteristic curve further approaches dicom standard curve, the school corresponding to each tonal range is ultimately produced
Positive coefficient table.
M is preferably equal to 16, and the tonal range quantity J of division is equal to 3；Low tonal range is 0-255, corresponds to γ1Selection
2.0-2.3；Intermediate gradation range is 256-511, corresponding γ2Select 2.3-2.6；High tonal range is 512-1023, corresponding γ3
Select 2.6-2.9.
The invention solves second technical problem be to provide it is a kind of use above-mentioned display characteristic curve correcting method, make
LED display display characteristic curve meets the control system of the medical LED display of dicom standard.
In order to solve the above-mentioned technical problem, medical LED display control system of the invention include sending card, receive card and
Adapter；The sending card includes HDMI interface, picture processing chip, transmitting terminal main control chip, the output of transmitting terminal kilomega network
Interface；HDMI interface receives the 10bit medical image data of PC machine transmission and is handled it to obtain TMDS signal, TMDS letter
Number R, G, B gradation data are converted into through picture processing chip and is sent to transmitting terminal main control chip, then through transmitting terminal main control chip
It carries out image buffer storage and data subpackage is handled, then reception card is sent to by kilomega network output interface；Receiving card includes receiving end
Kilomega network input interface, receiving end main control chip；It is given after receiving the subpackage image data of card kilomega network interface sending card
Receiving end main control chip, receiving end main control chip carries out gamma transformation to image data and gamma correction obtains meeting DICOM mark
Quasi- M bit driving data receives card for LED display driving data and resolves into multiple independent winding displacement signal driving display moulds
Group, so that LED display be driven to show medical image.
Detailed description of the invention
Invention is further described in detail with reference to the accompanying drawings and detailed description.
Fig. 1 is medical LED display control system functional block diagram of the invention.
Fig. 2 is the display characteristic curve correcting method flow chart of medical LED display of the invention.
Fig. 3 is the display characteristic curve and standard DICOM curve control figure of LED display of the invention.
Specific embodiment
As shown in Figure 1, medical LED display control system of the invention includes sending card, receives card and adapter；It is described
Sending card receive the 10bit medical image data that PC machine is sent, be packaged to the reception card of distal end after caching；Receiving card interception needs
Image data to be shown is processed and displayed, and unwanted picture data are transferred to other and are received and are blocked；Adapter and
Card connection is received, driving data is resolved into multiple independent winding displacement signals and drives display module.
The sending card includes HDMI interface, picture processing chip, transmitting terminal main control chip, the output of transmitting terminal kilomega network
Interface；The 10bit medical image and being handled it that HDMI interface receives PC machine transmission obtains TMDS signal, and (transition modulation is poor
Sub-signal), TMDS signal is converted into R, G, B gradation data through picture processing chip and is sent to transmitting terminal main control chip, then passes through
Transmitting terminal main control chip carries out image buffer storage and data subpackage handles and is sent to reception card by kilomega network output interface；Receive card
Including receiving end kilomega network input interface, receiving end main control chip；Receive the subpackage video of card kilomega network interface sending card
Give receiving end main control chip after data, receiving end main control chip to 10bit medical image gradation data carry out gamma transformation and
Gamma correction obtains the LED display driving data for meeting dicom standard.
The sending card and reception card can also include the supplementary modules such as image buffer storage module, configuration module.
Transmitting terminal main control chip and receiving end main control chip can be realized using FPGA programming.
The present invention can use the data transfer mode of DDR clock, and data transmission period is shortened half.Grayscale clock exists
PWM ranks integrated chip chip interior carries out frequency multiplication, grayscale clock frequency is greatly improved, while by calculating, and row is scanned number
It is designed as optimal, realization 16bit gray scale while meeting high refresh rate.Then control system calls configuration module program
Area and configuring area relative program, and PWM ranks integrated chip is driven according to driver' s timing, driving LED display is shown.
Medical LED display driving data can choose 14bit, 15bit or 16bit；Below to reception by taking M=16 as an example
The primary control program process of end main control chip is described in detail.
Image gradation data is divided into low tonal range (0-255), intermediate gradation range (256-511), high tonal range
(512~1024), corresponding gamma factor select γ respectively1For 2.0-2.3, γ2For 2.3-2.6, γ3For 2.6-2.9.
Receiving end main control chip carries out the method for gamma transformation and gamma correction such as to 10bit medical image gradation data
Under:
Step 1: receive 10bit medical image gradation data, to each affiliated tonal range of pixel 10bit gradation data into
Row judgement searches transformation coefficient table according to judging result, obtains corresponding adjustment factor and gamma factor；Utilize gamma transformation public affairs
Formula converts each pixel 10bit gradation data to obtain the 16bit gradation data of each pixel；
Wherein g is the 10bit gradation data of pixel, and s is the 16bit gradation data of pixel；c1、c2、c3Respectively each gray scale
The corresponding adjustment factor of range；
Step 2: by corresponding in the 16bit gradation data of each pixel 3 correction coefficient tables corresponding with each tonal range
Brightness correction coefficients are multiplied to obtain the 16bit driving data of each pixel；
The method for building up of the transformation coefficient table and correction coefficient table is as follows:
Step 1 establishes transformation coefficient table；
Input belongs to the 10bit gradation data g in low tonal range respectively1(g1It can choose any one ash between 0-255
Angle value), belong to 10bit gradation data g in intermediate gradation range2(g2Can choose any one gray value between 256-511),
Belong to the 10bit gradation data g in high tonal range3(g3It can choose any one gray value between 512-1023)；Utilize gamma
Transformation for mula is converted to obtain corresponding 16bit gradation data s to be calibrated1、s2、s3；16bit grey to be calibrated is used respectively
According to s1、s2、s3Medical LED display is driven to be shown；
For low tonal range, enabling the initial value of adjustment factor c is c0, c0=2.44x10-4~5.52x10-3, to medical
The brightness data of each pixel of LED display is acquired, while constantly adjustment adjustment factor c, so that display screen display characteristic is bent
Line (relation curve of i.e. each pixel display brightness and gradation data) approaches dicom standard curve, finally obtains corresponding to low ash
Spend the adjustment factor c of range1；Similarly, the adjustment factor c corresponding to intermediate gradation range is obtained2With correspond to high tonal range
Adjustment factor c3；By γ1、γ2、γ3And c1、c2、c3It is stored in transformation coefficient table；
Step 2 establishes correction coefficient table:
Input belongs to the 10bit gradation data g in low tonal range1, search transformation coefficient table and obtain corresponding adjusting system
Several and gamma factor；Each pixel 10bit gradation data is converted using gamma transformation formula to obtain corresponding 16bit gray scale
Data drive medical LED display to be shown with this；
The brightness data of each pixel of medical LED display is acquired, at the same by display screen display characteristic curve with
Dicom standard is compared, and adjusts the corresponding brightness correction coefficients of each pixel, is guaranteeing the entire consistent premise of brightness of display screen
Down so that display screen display characteristic curve further approaches dicom standard curve, the school corresponding to low tonal range is ultimately produced
Positive coefficient Table I1；
Similarly, the correction coefficient Table I corresponding to intermediate gradation range can be generated2With the correction for corresponding to high tonal range
Coefficient table I3。
As shown in figure 3, A is dicom standard curve, I, II, III is respectively low tonal range, intermediate gradation range, high ash
Spend the corresponding display screen display characteristic curve of range, the display characteristic curve as can be seen from the figure obtained using the present invention with
Dicom standard curve matching is preferable, and luminosity response error rate is less than 10.
The above, only presently preferred embodiments of the present invention, the invention is not limited to above embodiment, as long as
It reaches not found technical effect with identical means, all should belong to protection scope of the present invention.
Claims (3)
1. a kind of display characteristic curve correcting method of medical LED display, it is characterised in that include the following steps:
Step 1: receiving 10bit medical image gradation data, each affiliated tonal range of pixel 10bit gradation data is sentenced
Break and transformation coefficient table is searched according to judging result, obtains corresponding adjustment factor and gamma factor；Utilize gamma transformation formula
(1) each pixel 10bit gradation data is converted to obtain the M bit gradation data of each pixel；
Wherein giFor the 10bit gradation data of pixel i, siFor the M bit gradation data of pixel i；cjFor gray scale belonging to pixel i
The corresponding adjustment factor of range j, γjFor the corresponding gamma factor of tonal range j belonging to pixel i, j=1,2 ... J, J are to divide
Tonal range quantity；J is 3~4；
Step 2: the M bit gradation data of each pixel is multiplied to obtain with corresponding brightness correction coefficients in J correction coefficient table
The M bit driving data of each pixel；
The method for building up of the transformation coefficient table and correction coefficient table is as follows:
Step 1 establishes transformation coefficient table；
Input belongs to the 10bit gradation data in each tonal range respectively, is converted to obtain to it using formula (2) corresponding
M bit gradation data to be calibrated drives medical LED display to be shown with M bit gradation data to be calibrated；
Wherein gjFor the 10bit gradation data for belonging to tonal range j, sjFor corresponding M bit gradation data to be calibrated；γjFor ash
Spend the corresponding gamma factor of range j；If the initial value of adjustment factor c is c0, c0=2.44x10-4~5.52x10-3, to medical
The brightness data of each pixel of LED display is acquired, while constantly adjustment adjustment factor c, so that display screen display characteristic is bent
Line approaches dicom standard curve, finally obtains the adjustment factor c corresponding to tonal range jj；By γj、cjIt is stored in transformation coefficient
Table finally obtains the transformation coefficient table contained corresponding to each tonal range gamma factor and adjustment factor；
Step 2 establishes correction coefficient table:
Input belongs to the 10bit gradation data of each tonal range respectively, search transformation coefficient table obtain corresponding adjustment factor and
Gamma factor；Each pixel 10bit gradation data is converted using gamma transformation formula to obtain the M bit grey of each pixel
According to driving medical LED display to be shown with this；
The brightness data of each pixel of medical LED display is acquired, while display screen display characteristic curve and DICOM being marked
Standard is compared, and adjusts the corresponding brightness correction coefficients of each pixel, makes under the premise of guaranteeing that entire brightness of display screen is consistent
Display screen display characteristic curve further approaches dicom standard curve, ultimately produces the correction coefficient corresponding to each tonal range
Table.
2. the display characteristic curve correcting method of medical LED display according to claim 1, it is characterised in that M is equal to
16, the tonal range quantity J of division is equal to 3；Low tonal range is 0-255, corresponds to γ1Select 2.0-2.3；Intermediate gradation range
For 256-511, corresponding γ2Select 2.3-2.6；High tonal range is 512-1023, corresponding γ3Select 2.6-2.9.
3. a kind of medical LED of the display characteristic curve correcting method using medical LED display as described in claim 1 is aobvious
The control system of display screen, it is characterised in that including sending card, receive card and adapter；The sending card include HDMI interface,
Picture processing chip, transmitting terminal main control chip, transmitting terminal kilomega network output interface；HDMI interface receives the 10bit of PC machine transmission
Medical image data simultaneously handles it to obtain TMDS signal, and TMDS signal is converted into R, G, B gray scale through picture processing chip
Data Concurrent gives transmitting terminal main control chip, then carries out image buffer storage and data subpackage processing through transmitting terminal main control chip, then lead to
It crosses kilomega network output interface and is sent to reception card；Receiving card includes receiving end kilomega network input interface, receiving end main control chip；It connects
Receiving end main control chip is given after receiving the subpackage image data of card kilomega network interface sending card, receiving end main control chip is to figure
The M bit driving data for meeting dicom standard is obtained as data carry out gamma transformation and gamma correction, card is received and shows LED
Screen driving data resolves into multiple independent winding displacement signal driving display modules, so that LED display be driven to show medical image.
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| CN110277054A (en) * | 2019-07-23 | 2019-09-24 | 中国科学院长春光学精密机械与物理研究所 | A kind of LED display multi-grey level bearing calibration |
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| CN110277054A (en) * | 2019-07-23 | 2019-09-24 | 中国科学院长春光学精密机械与物理研究所 | A kind of LED display multi-grey level bearing calibration |
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| CN110689841A (en) * | 2019-11-18 | 2020-01-14 | 颜色空间(北京)科技有限公司 | Point-to-point correction method for LED display screen |
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| US11862077B2 (en) | 2020-04-27 | 2024-01-02 | Boe Technology Group Co., Ltd. | Method for improving image display quality, timing controller and display apparatus |
| CN112419965A (en) * | 2020-11-16 | 2021-02-26 | 中科芯集成电路有限公司 | Correction Gamma correction method based on LED display driving chip |
| CN112419965B (en) * | 2020-11-16 | 2021-08-20 | 中科芯集成电路有限公司 | Correction Gamma correction method based on LED display driving chip |
| CN117496887A (en) * | 2024-01-02 | 2024-02-02 | 吉林大学 | LED medical display high-definition gray scale control system |
| CN117496887B (en) * | 2024-01-02 | 2024-03-12 | 吉林大学 | LED medical display high-definition gray scale control system |
| CN117558214A (en) * | 2024-01-12 | 2024-02-13 | 吉林大学 | Green healthy medical LED display pixel and medical LED display screen |
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